I have a HP Elitebook 850 G5 which repeatedly plays the disconnect/connect sounds. This started some time ago - maybe after a system update. I tried to find the cause for this behaviour and found the device ID to be USB\VID_8087. The HP support forum suggests to install the intel Bluetooth driver - which I did. But it did not solve the problem. Further investigation showed, that the whole Bluetooth branch is missing from the device manager.
I tried uninstalling the Intel drivers and even deleting the USB Devices but none of which solved the problem. Any ideas how to restore Bluetooth functionality?